abbr. 概率分部函数（Probability Distribution Function）
🗣️ 情景例句
Maybe I can help. Tell me what it is, Susan.
也许我能帮忙。说给我听听 ，Susan。
Where the sun enterd, the doctor does not.
阳光照耀处，医生就不需。
Huifang jumped quite far, but Ann jumped farther.
惠芳跳得相当远，但是安跳得更远。